Measuring Spatiotemporal Features of Land Subsidence, Groundwater Drawdown, and Compressible Layer Thickness in Beijing Plain, China

Li, Yongyong; Gong, Huili; Zhu, Lin; Li, Xiaojuan

doi:10.3390/w9010064

Cited by 30 publications

(9 citation statements)

References 48 publications

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“…Water resources mapping and management Glaciers mapping Landsat, ASTER GDEM, GIS, TIN 3D model. [36] Soil moisture detection GPR, CMP, FO, GIS spatial analysis [16] Groundwater and subsidence analysis GIS spatial analysis, GPS [37] Irrigation planning UAV, HTM for video image classification, GIS visualization [32] Rainfall measurements and design storm…”

Section: Application Fields Specific Contents Gis Algorithm Model mentioning

confidence: 99%

“…Groundwater is an important freshwater resource in mid-latitude and in arid and semiarid regions. Instead of directly measuring the soil moisture or aforementioned glaciers, Li et al [37] in this special issue used GIS and statistical tools to study the geographic distribution of land subsidence, groundwater drawdown, and compressible layer thickness using in situ monitoring data in the metropolitan areas of Beijing, the capital of China. The Beijing Plain lies in the alluvial-pluvial plain fan built up by river deposits and belongs to the temperate continental monsoon climate with annual mean temperature of 10-15 • C and precipitation of 601 mm.…”

Section: Water Resources Mapping and Managementmentioning

confidence: 99%

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A Review on Applications of Remote Sensing and Geographic Information Systems (GIS) in Water Resources and Flood Risk Management

Wang

Xie

2018

Water

127

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Water is one of the most critical natural resources that maintain the ecosystem and support people's daily life. Pressures on water resources and disaster management are rising primarily due to the unequal spatial and temporal distribution of water resources and pollution, and also partially due to our poor knowledge about the distribution of water resources and poor management of their usage. Remote sensing provides critical data for mapping water resources, measuring hydrological fluxes, monitoring drought and flooding inundation, while geographic information systems (GIS) provide the best tools for water resources, drought and flood risk management. This special issue presents the best practices, cutting-edge technologies and applications of remote sensing, GIS and hydrological models for water resource mapping, satellite rainfall measurements, runoff simulation, water body and flood inundation mapping, and risk management. The latest technologies applied include 3D surface model analysis and visualization of glaciers, unmanned aerial vehicle (UAV) video image classification for turfgrass mapping and irrigation planning, ground penetration radar for soil moisture estimation, the Tropical Rainfall Measuring Mission (TRMM) and the Global Precipitation Measurement (GPM) satellite rainfall measurements, storm hyetography analysis, rainfall runoff and urban flooding simulation, and satellite radar and optical image classification for urban water bodies and flooding inundation. The application of those technologies is expected to greatly relieve the pressures on water resources and allow better mitigation of and adaptation to the disastrous impact of droughts and flooding.

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Section: Application Fields Specific Contents Gis Algorithm Model mentioning

confidence: 99%

Section: Water Resources Mapping and Managementmentioning

confidence: 99%

A Review on Applications of Remote Sensing and Geographic Information Systems (GIS) in Water Resources and Flood Risk Management

Wang

Xie

2018

Water

127

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“…As an energy-saving building material with good performances of lightweight and thermal insulation, autoclaved aerated concrete (AAC) has been widely used in building structures as the filling walls or the load-bearing walls [ 1 , 2 , 3 , 4 ]. With a premise of required strength and density, AAC should be produced with lowest thermal conductivity to be used as the enveloped self-insulation block walls [ 4 , 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…It is known that the thermal performance of AAC relates to the porosity: the larger the porosity, the lower the thermal conductivity, which is greatly affected by the addition of an Al component, because the air pore is mainly made of aluminum powder [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. By using Al powder, Al paste and highly dispersed Al particles, different pore shapes of AAC can be generated.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pore Structure on Thermal Conductivity and Mechanical Properties of Autoclaved Aerated Concrete

Chen

Jing

et al. 2021

Materials

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With the premise of investigating mechanical properties, the thermal conductivity of autoclaved aerated concrete (AAC) is a key index of self-insulation block walls for building energy conservation. This study focused on the effect of pore structures on the mechanical performance and thermal conductivity of AAC with the comparison of AAC base materials. Different kinds of AAC and their base materials were prepared and experimentally investigated. While maintaining a consistent mix proportion of the AAC base material, the pore structure of AAC was changed by the dosage of aluminum power/paste, foam stabilizer, and varying the stirring time of aluminum paste. The steam curing systems of AAC and the base material were determined based on SEM (Scanning Electronic Microscopy) and XRD (X-ray Diffraction) tests. With almost the same apparent density, the pore size decreased with the increasing content of foam stabilizer, and the mixing time of aluminum paste and foam stabilizer has a great influence on pore size. The thermal conductivity test and compressive test results indicated that that pore size had an effect on the thermal conductivity, but it had little effect on the compressive strength, and the thermal conductivity of sand aeration AAC was 8.3% higher than that of fly ash aeration AAC; the compressive strength was 10.4% higher, too. With almost the same apparent density, the regression mathematical model indicates that the thermal conductivity of AAC increased gradually with the increase of pore size, but it had little effect on the compressive strength. From the test results of basic mechanical properties, the mechanical model of cubic compressive strength, elastic modulus, axial compressive strength, and splitting tensile strength was obtained. The proposed stress–strain relationship model could well describe the relationship of AAC and the base material at the rising section of the curve.

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“…Research on land subsidence has mainly focused on two aspects: land subsidence monitoring and land subsidence prediction. Land subsidence monitoring uses various techniques, such as interferometric synthetic aperture radar (InSAR) [15][16][17], leveling surveys, borehole extensometers [18,19] and GPS data [20,21] to characterize the spatial and temporal distribution of subsidence [22][23][24][25][26][27][28]. Land subsidence prediction uses statistical modeling, numerical simulation and artificial intelligence.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of land subsidence in response to groundwater withdrawal and recharge in Changping District of Beijing

et al. 2020

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Over exploitation of groundwater in Changping District of Beijing city has caused serious land subsidence in the past decades. In recent years, the operation of the South-to-North Water Transfer Project has reduced the land subsidence rate. In this paper, Experimental tests are performed using the GDS Consolidation Testing System to characterize the compression and rebound of soils at depths of less than 100 m caused by groundwater withdrawal and recharge in Changping District. The results indicate that the compressible layers are the main contributors to land subsidence. The first compressible layer experiences greater deformation and more considerable hysteresis than the other compressible layers with the same decrease in the pore water pressure. Therefore, the exploitation of the adjacent aquifer should be controlled in the future. The deformation in the second and third compressible layers is a gradual and long-term process with little rebound; therefore, the subsidence should be seriously addressed when the groundwater in the two compressible layers is exploited on a large scale. In the same compressible layer, silty clay is more compressible and hysteretic than silt. For the same soil sample, the deformation rate decreases gradually as the pore water pressure decreases, whereas the creep deformation shows an overall increasing trend. A parameter named the subsidence index C w is proposed in this paper to describe the soil compressibility during groundwater withdrawal. All the soil samples are characterized by elastic-plastic deformation, and the shallow soil samples with less pore water pressure decrease are more likely to rebound.

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Measuring Spatiotemporal Features of Land Subsidence, Groundwater Drawdown, and Compressible Layer Thickness in Beijing Plain, China

Cited by 30 publications

References 48 publications

A Review on Applications of Remote Sensing and Geographic Information Systems (GIS) in Water Resources and Flood Risk Management

A Review on Applications of Remote Sensing and Geographic Information Systems (GIS) in Water Resources and Flood Risk Management

Effect of Pore Structure on Thermal Conductivity and Mechanical Properties of Autoclaved Aerated Concrete

Experimental study of land subsidence in response to groundwater withdrawal and recharge in Changping District of Beijing

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